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Annotation of xinu/sys/LSI/ibnew.c, revision 1.1

1.1     ! root        1: /* ibnew.c - ibnew */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <io.h>
        !             6: #include <disk.h>
        !             7: #include <lfile.h>
        !             8: #include <dir.h>
        !             9: 
        !            10: /*------------------------------------------------------------------------
        !            11:  *  ibnew  --  allocate a new iblock from free list on disk
        !            12:  *------------------------------------------------------------------------
        !            13:  */
        !            14: ibnew(diskdev, writedir)
        !            15: int    diskdev;
        !            16: Bool   writedir;
        !            17: {
        !            18:        struct  dir     *dirptr;
        !            19:        struct  iblk    iblock;
        !            20:        IBADDR  inum;
        !            21:        int     i;
        !            22:        int     sem;
        !            23: 
        !            24:        sem =  ((struct dsblk *)devtab[diskdev].dvioblk)->dflsem;
        !            25:        dirptr = dsdirec(diskdev);
        !            26:        wait(sem);
        !            27:        inum = dirptr->d_filst;
        !            28:        ibget(diskdev, inum, &iblock);
        !            29:        dirptr->d_filst = iblock.ib_next;
        !            30:        if (writedir)
        !            31:                write(diskdev, dskbcpy(dirptr), DIRBLK);
        !            32:        signal(sem);
        !            33:        ibclear(&iblock, 0L);
        !            34:        ibput(diskdev, inum, &iblock);
        !            35:        return(inum);
        !            36: }

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